5 interview rounds (1hr), nearly all were technical (fully or partially), with the main theme in them being "Explain how you will solve our problem" keeping rich notes throughout my responses (don't want to disclose any details regarding the nature of the problem). In fact, one of those interviews was specifically for this purpose, asking me to provide an end-to-end solution to their problem, which is just a big red flag. Really they just wanted free insights- their expertise on the subject was limited.